2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice unmodified, this list of conditions, and the following
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 #ifndef _LINUX_SCHED_H_
32 #define _LINUX_SCHED_H_
34 #include <sys/param.h>
35 #include <sys/systm.h>
37 #include <sys/sched.h>
38 #include <sys/sleepqueue.h>
40 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
42 #define TASK_RUNNING 0
43 #define TASK_INTERRUPTIBLE 1
44 #define TASK_UNINTERRUPTIBLE 2
46 #define TASK_WAKEKILL 128
47 #define TASK_WAKING 256
49 #define TASK_SHOULD_STOP 1
50 #define TASK_STOPPED 2
53 * A task_struct is only provided for those tasks created with kthread.
54 * Using these routines with threads not started via kthread will cause
55 * panics because no task_struct is allocated and td_retval[1] is
56 * overwritten by syscalls which kernel threads will not make use of.
59 struct thread *task_thread;
60 int (*task_fn)(void *data);
67 #define current task_struct_get(curthread)
68 #define task_struct_get(x) ((struct task_struct *)(uintptr_t)(x)->td_retval[1])
69 #define task_struct_set(x, y) (x)->td_retval[1] = (uintptr_t)(y)
71 /* ensure the task_struct pointer fits into the td_retval[1] field */
72 CTASSERT(sizeof(((struct thread *)0)->td_retval[1]) >= sizeof(uintptr_t));
74 #define set_current_state(x) \
75 atomic_store_rel_int((volatile int *)¤t->state, (x))
76 #define __set_current_state(x) current->state = (x)
87 if (current->state == TASK_INTERRUPTIBLE || \
88 current->state == TASK_UNINTERRUPTIBLE) { \
89 sleepq_add(c, NULL, "task", SLEEPQ_SLEEP, 0); \
93 sched_relinquish(curthread); \
97 #define wake_up_process(x) \
102 c = (x)->task_thread; \
104 (x)->state = TASK_RUNNING; \
105 wakeup_swapper = sleepq_signal(c, SLEEPQ_SLEEP, 0, 0); \
107 if (wakeup_swapper) \
111 #define cond_resched() if (!cold) sched_relinquish(curthread)
113 #define sched_yield() sched_relinquish(curthread)
116 schedule_timeout(signed long timeout)
121 pause("lstim", timeout);
126 #endif /* _LINUX_SCHED_H_ */